HERA光生过程中的强子与光子产生  

Hadron and photon productionin in photoproduction processes at HERA

作　　者：徐晓梅[1] 李云德[2] 

机构地区：[1]云南师范大学物理系,云南昆明650092 [2]云南大学物理系,云南昆明650091

出　　处：《云南师范大学学报（自然科学版）》2000年第1期27-30,共4页Journal of Yunnan Normal University:Natural Sciences Edition

摘　　要：本文讨论了HERA 硬光生过程中的强子和光子产生问题。在QCD 领头级近似之下计算了单、双光子的产生截面。结果表明:在低xt 情况下,分解过程的贡献很重要,不应当把分解过程看作直接过程的高阶修正,而应当把它视为独立的过程进行研究。因此,利用光生过程来研究夸克、胶子的强子和光子碎裂函数,以及研究质子和光子的部分子分布函数是可行的。In the paper problems of hadron and photon production in hardphotoproduction processes at HERA have been disscussed. Cross sections of both single and double photon are calculated in leading order QCD corrections. It is shown that the resolved process is dominant in low x t region. It should not be taken as the higher order QCD process of the direct process, it can be researched independently. So hotoproduction processes can be used to study quark, gluon fragmentation functions, as well as to probe parton distribution functions in proton and photon.

关 键 词：直接光子 微扰QCD HERA 光子 强子 光生过程 

分 类 号：O572.31[理学—粒子物理与原子核物理]